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| Clement Escoffier | 8251f60 | 2009-01-15 15:35:17 +0000 | [diff] [blame] | 184 | <h1><a name="WhiteBoardPatternHandler-Thewhiteboardpatternhandler"></a>The white board pattern handler</h1> |
| 185 | <p>The objective of this handler is to simplify the development of |
| 186 | white-board architecture. This architecture-style is based is very |
| 187 | close to the extender architecture style but use services instead of |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 188 | bundles.</p> |
| 189 | |
| 190 | <div class="toc"> |
| 191 | <ul> |
| 192 | <li><a href="#WhiteBoardPatternHandler-Thewhiteboardpattern">The whiteboard pattern</a></li> |
| 193 | <li><a href="#WhiteBoardPatternHandler-Usingthehandler">Using the handler</a></li> |
| 194 | <li><a href="#WhiteBoardPatternHandler-Configuration">Configuration</a></li> |
| 195 | <li><a href="#WhiteBoardPatternHandler-Configuringthehandlerwithannotations">Configuring the handler with annotations</a></li> |
| 196 | <li><a href="#WhiteBoardPatternHandler-Download">Download</a></li> |
| 197 | </ul></div> |
| 198 | |
| 199 | <div class="panelMacro"><table class="infoMacro"><colgroup><col width="24"><col></colgroup><tbody><tr><td valign="top"><img src="white-board-pattern-handler_files/information.gif" alt="" border="0" align="absmiddle" height="16" width="16"></td><td><b>Change in the 1.2.0</b><br><p>The 1.2.0 uses the namespace <tt>org.apache.felix.ipojo.whiteboard</tt> instead of <tt>org.apache.felix.ipojo.white-board-pattern</tt></p></td></tr></tbody></table></div> |
| 200 | |
| 201 | <h2><a name="WhiteBoardPatternHandler-Thewhiteboardpattern"></a>The whiteboard pattern</h2> |
| 202 | <p>A whiteboard is based on two different roles:</p> |
| Clement Escoffier | 8251f60 | 2009-01-15 15:35:17 +0000 | [diff] [blame] | 203 | <ul> |
| 204 | <li>A consumer looking to special services or a services published with a special mark</li> |
| 205 | <li>Looked services</li> |
| 206 | </ul> |
| Clement Escoffier | 8350751 | 2008-10-13 07:33:03 +0000 | [diff] [blame] | 207 | |
| 208 | |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 209 | <p>More information on this pattern is available in this <a href="http://www.osgi.org/wiki/uploads/Links/whiteboard.pdf" rel="nofollow">document</a><br> |
| Clement Escoffier | 8251f60 | 2009-01-15 15:35:17 +0000 | [diff] [blame] | 210 | Implementing a white board pattern could be complex as the extender |
| 211 | needs to track these services dynamically. Indeed looked services can |
| 212 | be highly dynamic; they can arrive, leave or be modified at runtime.<br> |
| 213 | Several services specified in the OSGi specification use white board pattern such as the Device Access Manager.</p> |
| 214 | |
| Clement Escoffier | 8251f60 | 2009-01-15 15:35:17 +0000 | [diff] [blame] | 215 | <h2><a name="WhiteBoardPatternHandler-Usingthehandler"></a>Using the handler</h2> |
| 216 | <p>First of all, you need to configure the component type to use the handler such as:</p> |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 217 | <div class="code"> |
| 218 | <div class="dp-highlighter"><table class="dp-xml" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span></span><span class="tag"><</span><span>ipojo xmlns:</span><span class="attribute">wbp</span><span>=</span><span class="attribute-value">"org.apache.felix.ipojo.whiteboard"</span><span>> </span></td></tr><tr><td class="line2"> <span class="tag"><</span><span>component </span></td></tr><tr><td class="line1"> <span class="attribute">className</span><span>=</span><span class="attribute-value">"org.apache.felix.ipojo.test.FooWhiteBoardPattern"</span><span> </span></td></tr><tr><td class="line2"> <span class="tag">></span><span> </span></td></tr><tr><td class="line1"> <span class="tag"><</span><span>wbp:wbp </span></td></tr><tr><td class="line2"> <span class="attribute">filter</span><span>=</span><span class="attribute-value">"(my.property=1)"</span><span> </span></td></tr><tr><td class="line1"> <span class="attribute">onArrival</span><span>=</span><span class="attribute-value">"onArrival"</span><span> </span></td></tr><tr><td class="line2"> <span class="attribute">onDeparture</span><span>=</span><span class="attribute-value">"onDeparture"</span><span> </span></td></tr><tr><td class="line1"> <span class="attribute">onModification</span><span>=</span><span class="attribute-value">"onModification"</span><span> </span></td></tr><tr><td class="line2"> <span class="tag">/></span><span> </span></td></tr><tr><td class="line1"> </td></tr><tr><td class="line2"> <span class="tag"><</span><span>provides</span><span class="tag">/></span><span> </span></td></tr><tr><td class="line1"> <span class="tag"></</span><span>component</span><span class="tag">></span><span> </span></td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="xml:nocontrols:nogutter" rows="10" readonly="readonly"><ipojo xmlns:wbp="org.apache.felix.ipojo.whiteboard"> |
| Clement Escoffier | 8350751 | 2008-10-13 07:33:03 +0000 | [diff] [blame] | 219 | <component |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 220 | className="org.apache.felix.ipojo.test.FooWhiteBoardPattern" |
| Clement Escoffier | 8350751 | 2008-10-13 07:33:03 +0000 | [diff] [blame] | 221 | > |
| 222 | <wbp:wbp |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 223 | filter="(my.property=1)" |
| 224 | onArrival="onArrival" |
| 225 | onDeparture="onDeparture" |
| 226 | onModification="onModification" |
| Clement Escoffier | 8350751 | 2008-10-13 07:33:03 +0000 | [diff] [blame] | 227 | /> |
| 228 | |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 229 | <provides/> |
| 230 | </component></textarea> |
| 231 | <script class="javascript"> |
| 232 | if(!window.newcodemacro_initialised) |
| 233 | { |
| 234 | window.newcodemacro_initialised = true; |
| 235 | window.oldonloadmethod = window.onload; |
| 236 | window.onload = function(){ |
| 237 | dp.SyntaxHighlighter.HighlightAll('newcodemacro'); |
| 238 | if(window.oldonloadmethod) |
| 239 | { |
| 240 | window.oldonloadmethod(); |
| 241 | } |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | </script> |
| 246 | </div> |
| 247 | |
| Clement Escoffier | 8251f60 | 2009-01-15 15:35:17 +0000 | [diff] [blame] | 248 | <p>Notice that, this handler is an external handler. So, it uses the "org.apache.felix.ipojo.whiteboard" namespace.<br> |
| 249 | Once described, you can implement your component. The methods specified |
| 250 | methods will be called when a matching services arrives or leaves or |
| 251 | are modified. The modification callback is optional. A matching service |
| 252 | is detected by confronting the service reference against the specified |
| 253 | filter.<br> |
| 254 | The filter can target specific service interface (with the objectclass property) or property values.<br> |
| 255 | In the previous example, these methods could be: </p> |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 256 | <div class="code"> |
| 257 | <div class="dp-highlighter"><table class="dp-c" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span></span><span class="keyword">public</span><span> </span><span class="keyword">class</span><span> FooWhiteBoardPattern </span><span class="keyword">implements</span><span> Observable { </span></td></tr><tr><td class="line2"> List list = new ArrayList(); </td></tr><tr><td class="line1"> int modifications = 0; </td></tr><tr><td class="line2"> <span class="keyword">public</span><span> </span><span class="keyword">synchronized</span><span> </span><span class="keyword">void</span><span> onArrival(ServiceReference ref) { </span></td></tr><tr><td class="line1"> list.add(ref); </td></tr><tr><td class="line2"> } </td></tr><tr><td class="line1"> <span class="keyword">public</span><span> </span><span class="keyword">synchronized</span><span> </span><span class="keyword">void</span><span> onDeparture(ServiceReference ref) { </span></td></tr><tr><td class="line2"> list.remove(ref); </td></tr><tr><td class="line1"> } </td></tr><tr><td class="line2"> <span class="keyword">public</span><span> </span><span class="keyword">synchronized</span><span> </span><span class="keyword">void</span><span> onModification(ServiceReference ref) { </span></td></tr><tr><td class="line1"> modifications = modifications + 1; </td></tr><tr><td class="line2"> } </td></tr><tr><td class="line1"> <span class="keyword">public</span><span> </span><span class="keyword">synchronized</span><span> Map getObservations() { </span></td></tr><tr><td class="line2"> Map map = new HashMap(); </td></tr><tr><td class="line1"> map.put(<span class="string">"list"</span><span>, list); </span></td></tr><tr><td class="line2"> map.put(<span class="string">"modifications"</span><span>, new Integer(modifications)); </span></td></tr><tr><td class="line1"> <span class="keyword">return</span><span> map; </span></td></tr><tr><td class="line2"> } </td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="java:nocontrols:nogutter" rows="10" readonly="readonly">public class FooWhiteBoardPattern implements Observable { |
| 258 | List list = new ArrayList(); |
| 259 | int modifications = 0; |
| 260 | public synchronized void onArrival(ServiceReference ref) { |
| Clement Escoffier | 8350751 | 2008-10-13 07:33:03 +0000 | [diff] [blame] | 261 | list.add(ref); |
| 262 | } |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 263 | public synchronized void onDeparture(ServiceReference ref) { |
| Clement Escoffier | 8350751 | 2008-10-13 07:33:03 +0000 | [diff] [blame] | 264 | list.remove(ref); |
| 265 | } |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 266 | public synchronized void onModification(ServiceReference ref) { |
| Clement Escoffier | 8350751 | 2008-10-13 07:33:03 +0000 | [diff] [blame] | 267 | modifications = modifications + 1; |
| 268 | } |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 269 | public synchronized Map getObservations() { |
| 270 | Map map = new HashMap(); |
| 271 | map.put("list", list); |
| 272 | map.put("modifications", new Integer(modifications)); |
| 273 | return map; |
| 274 | }</textarea> |
| 275 | <script class="javascript"> |
| 276 | if(!window.newcodemacro_initialised) |
| 277 | { |
| 278 | window.newcodemacro_initialised = true; |
| 279 | window.oldonloadmethod = window.onload; |
| 280 | window.onload = function(){ |
| 281 | dp.SyntaxHighlighter.HighlightAll('newcodemacro'); |
| 282 | if(window.oldonloadmethod) |
| 283 | { |
| 284 | window.oldonloadmethod(); |
| 285 | } |
| 286 | } |
| 287 | } |
| 288 | |
| 289 | </script> |
| 290 | </div> |
| 291 | |
| Clement Escoffier | 8251f60 | 2009-01-15 15:35:17 +0000 | [diff] [blame] | 292 | <p>All method received the arriving, leaving or modified service reference.</p> |
| 293 | <h2><a name="WhiteBoardPatternHandler-Configuration"></a>Configuration</h2> |
| 294 | <p>The handler has only three mandatory attributes:</p> |
| 295 | <ul> |
| 296 | <li>Filter: filter use to discover matching filter.</li> |
| 297 | <li>onArrival: declaring the method to invoke when a matching service arrives</li> |
| 298 | <li>onDeparture: declaring the method to invoke when a matching service leaves</li> |
| 299 | </ul> |
| Clement Escoffier | 8350751 | 2008-10-13 07:33:03 +0000 | [diff] [blame] | 300 | |
| 301 | |
| Clement Escoffier | 8251f60 | 2009-01-15 15:35:17 +0000 | [diff] [blame] | 302 | <p>The onModification attribute is optional. This method is called when |
| 303 | an injected service reference is modified but stills valid against the |
| 304 | filter.</p> |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 305 | <div class="panelMacro"><table class="noteMacro"><colgroup><col width="24"><col></colgroup><tbody><tr><td valign="top"><img src="white-board-pattern-handler_files/warning.gif" alt="" border="0" align="absmiddle" height="16" width="16"></td><td><b>Notifications</b><br><p>The |
| 306 | implementation will be notified of arrivals, modifications and |
| Clement Escoffier | 8251f60 | 2009-01-15 15:35:17 +0000 | [diff] [blame] | 307 | departures, despite the instance is invalid. Indeed, the implementation |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 308 | must release all objects created from another bundle as soon it leaves.</p></td></tr></tbody></table></div> |
| 309 | <h2><a name="WhiteBoardPatternHandler-Configuringthehandlerwithannotations"></a>Configuring the handler with annotations</h2> |
| Clement Escoffier | 8251f60 | 2009-01-15 15:35:17 +0000 | [diff] [blame] | 310 | |
| 311 | <p>It is possible to configure the handler with a simple annotation |
| 312 | available in the annotation pack ('annotation' project in the iPOJO |
| 313 | trunk). Here is an example of usage:</p> |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 314 | <div class="code"> |
| 315 | <div class="dp-highlighter"><table class="dp-c" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span></span><span class="keyword">import</span><span> org.apache.felix.ipojo.annotations.Component; </span></td></tr><tr><td class="line2"><span class="keyword">import</span><span> org.osgi.framework.ServiceReference; </span></td></tr><tr><td class="line1"><span class="preprocessor"></span></td></tr><tr><td class="line2"><span class="preprocessor">@Component</span><span> </span></td></tr><tr><td class="line1"><span class="preprocessor">@org.apache.felix.ipojo.whiteboard.Wbp(filter="(foo=true)", </span><span> </span></td></tr><tr><td class="line2"> onArrival=<span class="string">"onArrival"</span><span>, </span></td></tr><tr><td class="line1"> onDeparture=<span class="string">"onDeparture"</span><span>, </span></td></tr><tr><td class="line2"> onModification=<span class="string">"onModification"</span><span>) </span></td></tr><tr><td class="line1"><span class="keyword">public</span><span> </span><span class="keyword">class</span><span> WhiteBoardExemple { </span></td></tr><tr><td class="line2"> </td></tr><tr><td class="line1"> <span class="keyword">public</span><span> </span><span class="keyword">void</span><span> onArrival(ServiceReference ref) { </span></td></tr><tr><td class="line2"> <span class="comment">// do something</span><span> </span></td></tr><tr><td class="line1"> } </td></tr><tr><td class="line2"> </td></tr><tr><td class="line1"> <span class="keyword">public</span><span> </span><span class="keyword">void</span><span> onDeparture(ServiceReference ref) { </span></td></tr><tr><td class="line2"> <span class="comment">// do something</span><span> </span></td></tr><tr><td class="line1"> } </td></tr><tr><td class="line2"> </td></tr><tr><td class="line1"> <span class="keyword">public</span><span> </span><span class="keyword">void</span><span> onModification(ServiceReference ref) { </span></td></tr><tr><td class="line2"> <span class="comment">// do something</span><span> </span></td></tr><tr><td class="line1"> } </td></tr><tr><td class="line2"> </td></tr><tr><td class="line1">} </td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="java:nocontrols:nogutter" rows="10" readonly="readonly">import org.apache.felix.ipojo.annotations.Component; |
| 316 | import org.osgi.framework.ServiceReference; |
| Clement Escoffier | 8251f60 | 2009-01-15 15:35:17 +0000 | [diff] [blame] | 317 | |
| 318 | @Component |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 319 | @org.apache.felix.ipojo.whiteboard.Wbp(filter="(foo=true)", |
| 320 | onArrival="onArrival", |
| 321 | onDeparture="onDeparture", |
| 322 | onModification="onModification") |
| 323 | public class WhiteBoardExemple { |
| Clement Escoffier | 8251f60 | 2009-01-15 15:35:17 +0000 | [diff] [blame] | 324 | |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 325 | public void onArrival(ServiceReference ref) { |
| 326 | // do something |
| 327 | } |
| Clement Escoffier | 8251f60 | 2009-01-15 15:35:17 +0000 | [diff] [blame] | 328 | |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 329 | public void onDeparture(ServiceReference ref) { |
| 330 | // do something |
| 331 | } |
| Clement Escoffier | 8251f60 | 2009-01-15 15:35:17 +0000 | [diff] [blame] | 332 | |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 333 | public void onModification(ServiceReference ref) { |
| 334 | // do something |
| 335 | } |
| Clement Escoffier | 8251f60 | 2009-01-15 15:35:17 +0000 | [diff] [blame] | 336 | |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 337 | }</textarea> |
| 338 | <script class="javascript"> |
| 339 | if(!window.newcodemacro_initialised) |
| 340 | { |
| 341 | window.newcodemacro_initialised = true; |
| 342 | window.oldonloadmethod = window.onload; |
| 343 | window.onload = function(){ |
| 344 | dp.SyntaxHighlighter.HighlightAll('newcodemacro'); |
| 345 | if(window.oldonloadmethod) |
| 346 | { |
| 347 | window.oldonloadmethod(); |
| 348 | } |
| 349 | } |
| 350 | } |
| 351 | |
| 352 | </script> |
| 353 | </div> |
| 354 | |
| Clement Escoffier | 8251f60 | 2009-01-15 15:35:17 +0000 | [diff] [blame] | 355 | |
| 356 | <p>The <tt>onModification</tt> attribute is optional.The <tt>filter</tt> attribute allows setting the service filter.</p> |
| Clement Escoffier | 8350751 | 2008-10-13 07:33:03 +0000 | [diff] [blame] | 357 | |
| Clement Escoffier | 8251f60 | 2009-01-15 15:35:17 +0000 | [diff] [blame] | 358 | <h2><a name="WhiteBoardPatternHandler-Download"></a>Download</h2> |
| 359 | <p>The handler is available on the <a href="http://felix.apache.org/site/download.html" title="Download">download</a> page.<br> |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 360 | Sources are available on the Felix trunk at the following location: <a href="http://svn.apache.org/repos/asf/felix/trunk/ipojo/handler/whiteboard" rel="nofollow">http://svn.apache.org/repos/asf/felix/trunk/ipojo/handler/whiteboard</a>. |
| 361 | <br clear="all"> |
| 362 | <br clear="all"></p> |
| Clement Escoffier | 8350751 | 2008-10-13 07:33:03 +0000 | [diff] [blame] | 363 | |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 364 | </div> |
| 365 | <img src="white-board-pattern-handler_files/footer.png" class="footer"> |
| 366 | </div> |
| Clement Escoffier | 8251f60 | 2009-01-15 15:35:17 +0000 | [diff] [blame] | 367 | |
| 368 | <script type="text/javascript"> |
| 369 | var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); |
| 370 | document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); |
| 371 | </script><script src="white-board-pattern-handler_files/ga.js" type="text/javascript"></script> |
| 372 | <script type="text/javascript"> |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 373 | try{ |
| Clement Escoffier | 8251f60 | 2009-01-15 15:35:17 +0000 | [diff] [blame] | 374 | var pageTracker = _gat._getTracker("UA-1518442-4"); |
| 375 | pageTracker._trackPageview(); |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 376 | } catch(err) {} |
| Clement Escoffier | 8251f60 | 2009-01-15 15:35:17 +0000 | [diff] [blame] | 377 | </script> |
| Clement Escoffier | 373a57d | 2009-07-21 12:06:46 +0000 | [diff] [blame^] | 378 | |
| Clement Escoffier | 8251f60 | 2009-01-15 15:35:17 +0000 | [diff] [blame] | 379 | </div> |
| 380 | </body></html> |